<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<title>飞机大战</title>
	</head>
	<body>
		<script>
		//将1~100的数字倒序输出.
		for (var i=100;i>=1;i--){
		document.write(i+"   ");	
		}
		
		</script>
	</body>
</html>